Means for holding normally reciprocating spindles from reciprocating



C. OTT

March 3, 1931.

MEANS FOR HOLDING NORMALLY RECIPROCATING SPINDLES FROM RECIPROGATING Filed July 29. 1927 JNVENTOR. 60 71 rad 0 t t I TTORNEY A Patented Mar. 3, 1931 UNITED STATES PAT T "OFFICE CONRAD err, or WAYNESBOBO, PENNsYLvAniA, assfeivon 'ro LAivDIs' T001. GOM- rying a grinding wheel in order to grind the PANY, OF WAYNESBQRO, PEN

NSYLVANIA, A CORPORATION MEANS FOR HOLDING NORMALLY RECIPROCATING SPINDLES :FBOM RECIPROCATING Application filed m 29, 1927. Serial no. 209,373.

This invention seeks to provide means for holding a normally reciprocating spindle from reciprocating.

In a grinding machine disclosed in a copending application of Scott H. Neady, Ser. No. 120,197, filed July 2, 1926, mechanism is shown for axially reciprocating a shaft carwork uniformly and to avoid scratching and marking the same. For grinding a shaft of uniform diameter throughout its length and for a shaft having no shoulders thereon such apparatus is sufiicient. If, however, it becomes necessary to grind a shaft having a shoulder thereon or one which has a pulley made integral with the shaft, the apparatus in the above named application is insuffi cient. In order to grind perfectly the grind ing wheel must be permitted to move past the point of grinding. Thisit cannot do when a shoulder is on the shaft. The shaft up next to the shoulder, therefore, will not be properly ground since the wheel cannot reciprocate beyond the shoulder on the shaft. The invention in this application seeks to provide means for holding the shaft against reciprocation while the wheel is moved up against the shoulder to grind the shaft up near the shoulder.

Referring to the accompanying drawings which are made a part hereof and on which similar reference characters indicate similar parts,

Figure 1 is a longitudinal sectional view with certain parts left in elevation with the grinding wheel in intermediate position,

Figure 2, an end elevation, and

Figure 3, a side elevation.

Figure 4 is a side elevation showing the grinding wheel at the extreme left against the work.

In the drawings numeral 10 indicates a shaft carrying a grinding wheel 11 for operation upon the work 12 which in this instance is a shaft having a shoulder 13 thereon and the grinding wheel is shown in position to grind the shaft up against the shoulder.

The shaft 10 has thereon a shoulder 14 which abuts against washers 15 and 16 surrounding the shaft between the shoulder and a flange 17 on a sleeve 18 which surrounds the shaft and. provides the medium through which the shaft 10 is reciprocated.

The mechanism for reciprocating the shaft 10 is' as follows:

A yoke 19 is pivoted on a pin 20 on the housing of the machine. This yoke carries a pair ofarms21 to which are attached abutting members 22 by means of pins 23. The yoke 19 is provided with a depending bifurcated arm. 24 having shoes or bushings 25 in the bifurcation of the end engaging an eccentric 26 carried by a shaft 27. The yoke 19 and the mechanism for giving it a swinging movement isthe same as that described in the above named application.

In the sleeve 18 are cup-shaped cavities 28. Adapted to telescope withinthe cavities'28 are hollow plungers 29. f Compression springs 30, attached to the inside of the plunger 29 and the bottom of the cavity 28, provide resilient operative connection between theswingingl yoke 19'and' the sleeve 18. As the yoke 19 is swung to the right, as shownin Fig. 1, abutments 22 engage the rounded end of the plungers 29 and compress the springs 30. Thistends to move the sleeve 18 and the shaft 10 to the right. The sleeve 18 abuts against washers 31 on the shaft 10.

A shoulder 32 on the shaft 10 is engaged by a ring 41 having an inner flange 42 thereon. .The ring 41is held against the shoulder 32 by a lock nut 43. v I

Pivoted on the frame of the machine at 34 is a lever 35 having bifurcations 36. Pins 37 carrying rollers 38 connect these bifurcations with a spool. 39 surrounding the end of the shaft 10. This spool is held in position by a nut 40. The shaft is allowed to rotate in the spool 39 but any axial movement of the shaft must carry with it a corresponding movement of the spool.

From the foregoing description the operation of the device should now be apparent. During normal operation of the machine rotation of the shaft 27 and the eccentric end 26 imparts a swinging movement to the yoke 19. The member 22, pressing against the plunger 29, compresses the spring 30 and this in turn acts upon the sleeve 18 to move the shaft axially to the right as shown in Figure 1. The inner end of each of the pins 23, shown in dotted lines in Figure 1, engages a slot in the sleeve 18. As the yokes 19 swing to the left the pins 23 move the sleeve 18 axially to the left to move the shaft 10. This shaft is, therefore, positively moved in one direction by the sleeve 18 abutting the shoulder 14, and resiliently moved in the other to operate the grinding wheel without the reci rocatin movement the ooerator' b means of the hand lever 35 holdsthe shaft 10 in the position shown in Fig. 1. When held in this position the movement of the swinging yoke 19 is taken up by the springs 30 and no reciprocation of the shaft 10oc-' curs. The wheel 11 may be held in this-position as long as desired by the operator oruntil the shaft up near the shoulder is ground to the desired size. Upon release of the handle 35 the shaft will again be reciprocated as before.

It will be obvious to those skilled in the art that various changes may be made in my device without departing-from the spirit of-the invention, and I, therefore, do not limit myself to what is shown in the drawings and described in the specification, but only as set forth in the appended claim.

Having thus fully described mysaid'invention, what Iclaim as new and desire to secure by Letters Patent, is:

A device ofthe kinddescribed comprising a shaft, a sleeve on said shaft and adaptedto move longitudinally therewith, a socket in said sleeve, a plunger in said socket, resilient means between said plunger and said socket, an arm pivoted at one end and'ha-Vingan abutment for engagement with the plunger, means for swingingthe pivoted arm to impart movement to said sleeve and shaft through said resilient means, andmanually controlled means for holding the shaft against axial movement during the swinging of said arm, substantially asset forth.

In witness whereof, I havehereunto set my hand at Vaynesboro, Pennsylvania, this 22nd day of July, A. D. nineteen hundred and twenty-seven.

GONRAD' OTT.

direction by the springs 30. When, however, it is desired 

